The book is now available! 189
(another Prime Pages' Curiosity)
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+ The product of the four primes in a prime quadruplet (except for 5,7,11,13) always ends in 189. [Rupinski]

+ The 189th century would be the first to contain as few as five prime years (18803, 18839, 18859, 18869 and 18899).

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